Add GTM Alpha Consultant MCP Server

[shashwatgtm]

Adding GTM Alpha Consultant - a professional MCP server for GTM strategy consultation.

Features:

• EPIC framework analysis with real backend calculations
• 30-day consultation persistence
• Multi-LLM support (Claude, ChatGPT, Gemini)
• Progress tracking over time

Live endpoint: https://gtmalpha.netlify.app/.netlify/functions/mcp Documentation: https://github.com/shashwatgtm/gtm-expert-schema